9 - 2 CHAPTER 9 : MALFUNCTIONS
TRYTON 112 CNC
1. FACTORS AFFECTING PERFORMANCE
1.1 Installation
The installation is a very important phase that, if neglected, could seriously impede the
operation of the bar feed system.
1.1.1 Distance
The distance between the bar feed system and the lathe influences greatly the quality of the
guiding. The further the bar feed system is from the spindle -- and therefore, away from the
clamping system -- the larger the non-guided part of the bar will be.
It is essential that the mounting of the bar feed system is done in accordance with the
instructions indicated in Chapter 3: Setting into operation.
1.1.2 Alignment
Although the bar rotates in an oil bath inside the barrel, the guidance tube must be perfectly
aligned on the spindle axis.
It is essential that the alignment of the bar feed system is done in accordance with the
instructions indicated in Chapter 3: Setting into operation.
1.1.3 Spindle length
In some cases, the length of the spindle may influence the quality of the guidance.
1.2 Clearance between the channel and the bar
The best results are obtained when the bar is guided with precision (2 mm). The greater the
reduction of the clearance between the bar and the tube, the greater the rotation speeds will
be.
When the clearance between the bar and the tube becomes too great, a rupture of the oil film
occurs which results in the reduction of the rotation speeds permitted.
1.3 Clearance between the spindle and the bar
While the rear of the bar is maintained by front rest of the bar feed system and the front by
the collet or the chuck of the lathe, it is possible for the portion of the bar inside the spindle
to oscillate, if the clearance is too great.
It is, therefore, highly recommended to install reduction liner inside the spindle as indicated
in the Start Up manual.
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